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/* $Id$ */
/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <signal.h>
#include <pulsecore/macro.h>
#include <pulsecore/flist.h>
#include <pulsecore/once.h>
#include <pulsecore/thread.h>
#include <pulsecore/core-util.h>
#include "rtsig.h"
#ifdef SIGRTMIN
static void _free_rtsig(void *p) {
pa_rtsig_put(PA_PTR_TO_INT(p));
}
PA_STATIC_FLIST_DECLARE(rtsig_flist, pa_make_power_of_two(SIGRTMAX-SIGRTMIN+1), NULL);
PA_STATIC_TLS_DECLARE(rtsig_tls, _free_rtsig);
static pa_atomic_t rtsig_current = PA_ATOMIC_INIT(-1);
static int rtsig_start = -1, rtsig_end = -1;
int pa_rtsig_get(void) {
void *p;
int sig;
if ((p = pa_flist_pop(PA_STATIC_FLIST_GET(rtsig_flist))))
return PA_PTR_TO_INT(p);
sig = pa_atomic_dec(&rtsig_current);
pa_assert(sig <= SIGRTMAX);
pa_assert(sig <= rtsig_end);
if (sig < rtsig_start) {
pa_atomic_inc(&rtsig_current);
return -1;
}
return sig;
}
int pa_rtsig_get_for_thread(void) {
int sig;
void *p;
if ((p = PA_STATIC_TLS_GET(rtsig_tls)))
return PA_PTR_TO_INT(p);
if ((sig = pa_rtsig_get()) < 0)
return -1;
PA_STATIC_TLS_SET(rtsig_tls, PA_INT_TO_PTR(sig));
return sig;
}
void pa_rtsig_put(int sig) {
pa_assert(sig >= rtsig_start);
pa_assert(sig <= rtsig_end);
pa_assert_se(pa_flist_push(PA_STATIC_FLIST_GET(rtsig_flist), PA_INT_TO_PTR(sig)) >= 0);
}
void pa_rtsig_configure(int start, int end) {
int s;
sigset_t ss;
pa_assert(pa_atomic_load(&rtsig_current) == -1);
pa_assert(SIGRTMIN <= start);
pa_assert(start <= end);
pa_assert(end <= SIGRTMAX);
rtsig_start = start;
rtsig_end = end;
sigemptyset(&ss);
for (s = rtsig_start; s <= rtsig_end; s++)
pa_assert_se(sigaddset(&ss, s) == 0);
pa_assert(pthread_sigmask(SIG_BLOCK, &ss, NULL) == 0);
/* We allocate starting from the end */
pa_atomic_store(&rtsig_current, rtsig_end);
}
#else /* SIGRTMIN */
int pa_rtsig_get(void) {
return -1;
}
int pa_rtsig_get_for_thread(void) {
return -1;
}
void pa_rtsig_put(int sig) {
}
void pa_rtsig_configure(int start, int end) {
}
#endif /* SIGRTMIN */
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